Because they're in use. IIS uses them. You don't need them, you can certainly back up the contents without them. They're part of what FP extensions creates.

If you back up without them, and have to restore the site, you'll need to re-apply the FP extensions when you put all the files back, and make sure that you have all the permissions/settings correct. But you don't need them to back up the site files.

Generally, I recommend you NOT backup anything in that directory tree. Production should be left alone. It is exposed.

Rather,, create, design, develop elsewhere. Then, copy it over to the prime server. The original is now an instant backup, and it is not exposed (so if defacement, you get a measure of quick resource).

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

This question has been open for some time and is now in
need of wrapping up.

Please DO NOT accept this comment as the answer to the question, it is purely an alert to the fact that this question is still open.

It would be greatly appreciated if any of the participants could comment back here in order to give assistance in what the status of this question is and what should be done with it (delete, 0 PAQ, award points etc).

Accessibility and Usability are two concepts that seem to be closely related. But, too many people seem to have a distorted perception of them.
During last five years, those two words have come to the day-to-day work of almost every web develope…